US20120205999A1 - Electric motor having an end frame - Google Patents
Electric motor having an end frame Download PDFInfo
- Publication number
- US20120205999A1 US20120205999A1 US13/026,473 US201113026473A US2012205999A1 US 20120205999 A1 US20120205999 A1 US 20120205999A1 US 201113026473 A US201113026473 A US 201113026473A US 2012205999 A1 US2012205999 A1 US 2012205999A1
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- US
- United States
- Prior art keywords
- wall
- support surface
- bearing support
- annular
- axial bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
- H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor
Definitions
- the present invention relates to electric motors. More particularly, the invention relates to an electric motor that includes an end frame.
- An end frame for an electric motor should generally be rigid in order to minimize vibration and other adverse effects. In some cases, it is desirable to provide a flow path through the end frame for air cooling of the motor components. Some electric motors may also require periodic maintenance at the end frame, including the addition of grease to one or more shaft bearings.
- the invention provides an end frame for an electro-dynamic machine having a rotor shaft extending along a rotational axis and a bearing rotatably supporting the rotor shaft.
- the end frame includes a radial bearing support surface disposed concentrically about the axis and an axial bearing support surface substantially perpendicular to the axis.
- a base wall is substantially perpendicular to the axis.
- a first annular wall is disposed concentrically about the axis and extends from the base wall to the axial bearing support surface.
- a second annular wall is disposed radially outward of the first annular wall and cooperates therewith to define an annular space that extends from the base wall to the axial bearing support surface.
- a first boundary wall extends across the annular space from the base wall to the axial bearing support surface.
- a metering wall extends across the annular space a portion of a distance from the base wall to the axial bearing support surface.
- the base wall, the axial bearing support surface, the first annular wall, the second annular wall, the first boundary wall and the metering wall cooperate to define a first chamber for receiving grease.
- a second boundary wall extends across the annular space from the base wall to the axial bearing support surface.
- the base wall, the axial bearing support surface, the first annular wall, the second annular wall, the metering wall and the second boundary wall cooperate to define a second chamber for receiving grease.
- the invention provides an electro-dynamic machine.
- the machine includes a shaft member extending along an axis and a bearing supporting the shaft for rotation about the axis.
- a cylindrical housing is disposed concentric with the axis and radially supports the bearing.
- An axial bearing support surface is substantially perpendicular to the axis and axially supports the bearing.
- a base wall is axially displaced from the axial bearing support surface.
- a first annular wall is disposed concentrically about the axis and extends from the base wall to the axial bearing support surface.
- a second annular wall is disposed radially outward of the first annular wall and cooperates therewith to define an annular space that extends from the base wall to the axial bearing support surface.
- a first boundary wall extends across the annular space from the base wall to the axial bearing support surface.
- a metering wall extends across the annular space a portion of a distance from the base wall to the axial bearing support surface.
- the base wall, the axial bearing support surface, the first annular wall, the second annular wall, the first boundary wall and the metering wall cooperate to define a first chamber for receiving grease.
- a second boundary wall extends across the annular space from the base wall to the axial bearing support surface.
- the base wall, the axial bearing support surface, the first annular wall, the second annular wall, the metering wall and the second boundary wall cooperate to define a second chamber for receiving grease.
- FIG. 1 is a cross-sectional view of an electric motor.
- FIG. 2 is an exploded perspective view of a sub-assembly of the electric motor of FIG. 1 .
- FIG. 3 is a top view of an end frame of the sub-assembly of FIG. 2 .
- FIG. 4 is a top view of a bearing lubrication system of the end frame of FIG. 3 .
- FIG. 5 is a bottom perspective view of the end frame of FIG. 3 .
- FIG. 6 is a cross sectional view of the bearing lubrication system of FIG. 4 taken along section line 6 - 6 .
- FIG. 1 is a schematic cross section of an electric motor 10 .
- the electric motor 10 includes an end frame 14 and an opposite end frame 18 .
- a rotor shaft 22 is rotatably supported by an end frame bearing 26 and an opposite end frame bearing 30 .
- the rotor shaft 22 supports a rotor 34 for rotation about an axis 38 .
- the rotor 34 rotates relative to a stator 42 .
- the stator 42 is enclosed within a stator housing 44 and is disposed between the end frame 14 and the opposite end frame 18 .
- FIG. 2 is an exploded perspective view of a sub-assembly 46 of the electric motor 10 .
- the sub-assembly 46 includes the rotor shaft 22 , the end frame bearing 26 , and the end frame 14 .
- the end frame 14 includes an outer housing 50 and an inner housing 54 .
- the outer housing 50 includes four mounting flanges 58 .
- Each mounting flange 58 includes a through-hole 62 .
- the through-holes 62 are provided, for example, to receive assembly bolts for coupling the end frame 14 to the opposite end frame 18 . Fewer than four through-holes 62 or more than four may alternatively be provided, as required.
- the inner housing 54 defines a bearing cavity 66 .
- the bearing cavity 66 includes a precision bearing bore 70 .
- the bearing bore 70 is configured to receive the end frame bearing 26 .
- a shaft aperture 74 of the inner housing 54 allows an extension 76 of the shaft 22 to pass through the end frame 14 and couple to the load.
- a ventilated lattice 78 connects the outer housing 50 and inner housing 54 .
- the lattice 78 facilitates the flow of air (or other fluids) through the motor to cool the rotor, stator, and bearings during motor operation.
- the lattice 78 is formed by a combination of radial ribs 82 , non-radial ribs 86 , and annular ribs 90 .
- “non-radial” ribs do not include annular ribs.
- the lattice 78 is sufficiently rigid to substantially minimize oscillation of the end frame 14 , while at the same time allowing for adequate cooling flow through the motor, thereby improving the life of the end frame bearing 26 .
- the inner housing 54 , outer housing 50 , and lattice 78 may be formed by casting, forging, machining, injection molding, or other known manufacturing methods.
- the end frame 14 should slide freely over the end frame bearing 26 . If the bearing bore 70 is out of round, a number of assembly problems may result. For example, if the end frame 14 is forced over the bearing 26 with a mallet, the resulting impact forces may dent the balls and/or raceways of the bearing assembly, which may result in premature bearing wear.
- the non-radial ribs 86 are configured to reduce deformation of the bearing bore 50 during machining of the end frame 22 .
- the non-radial ribs 86 are arranged in three pairs 94 .
- the three pairs 94 of non-radial ribs 86 are arranged symmetrically (i.e., each pair 94 is approximately 120 degrees apart from the next pair).
- This symmetrical arrangement of the three pairs 94 corresponds generally to contact points 96 ( FIGS. 2 and 5 ) for a three jawed chuck, such as is used to hold the end frame 14 when machining the bearing bore 70 and other surfaces of the end frame 14 .
- the non-radial ribs 86 of each pair 94 form a “V” shape, with a vertex 98 adjacent the outer housing 50 .
- the vertex 98 is illustrated radially outward of the outer housing 50 . In other embodiments, the vertex may lie on or in the housing 50 .
- Each of the non-radial ribs 86 contacts the inner housing 54 substantially tangentially, as opposed to radially. With this arrangement, the non-radial ribs 86 transmit clamping forces to the inner housing and apply them in a direction that is tangent to the bore, thereby reducing deformation of the inner housing 54 when chucked.
- the resulting bearing bore 70 can be machined with a roundness having a tighter tolerance than would otherwise be possible with radial ribs that transmit the chuck clamping forces to radially to the bore.
- radial ribs 82 In addition to the non-radial ribs 86 , three of the radial ribs 82 are arranged symmetrically between non-radial ribs 86 . Additional radial ribs 82 cross, or intersect, several of the non-radial ribs 86 .
- the bearing cavity 66 includes a bearing lubrication system 102 .
- the bearing lubrication system 102 extends from a base wall 106 of the bearing cavity 66 toward an axial seating surface 108 of the bearing bore 70 .
- the base wall 106 surrounds the shaft aperture 74 .
- the bearing 26 encloses the bearing lubrication system 102 .
- the bearing lubrication system 102 includes a grease storage chamber 112 , a charging chamber 116 , and a metering wall 118 .
- the charging chamber 116 extends circumferentially about the shaft aperture 74 from a first boundary wall 120 to the metering wall 118 .
- the grease storage chamber 112 extends circumferentially about the shaft aperture 74 from the metering wall 118 to a second boundary wall 122 .
- the first boundary wall 120 and second boundary wall 122 extend axially to the same level as the axial seating surface 108 , and therefore define a portion of the seating surface 108 and make contact with the end frame bearing 26 when installed.
- the metering wall 118 does not extend all the way to the axial seating surface 108 of the bearing bore 70 .
- the charging chamber 116 and storage chamber 112 are both bounded by an inner annular wall 128 and an outer annular wall 132 .
- the inner annular wall 128 of the charging chamber 116 and storage chamber 112 is not parallel to the axis 38 (i.e., frusto-conical).
- the shape of the inner annular wall 128 assists grease in from the charging chamber and a portion of the storage chamber migrating toward the bearing 26 during motor operation.
- the charging chamber 116 receives grease from a grease inlet port 136 .
- the grease inlet port 136 may be threaded for a screw-in grease fitting (such as a “Zerk” fitting), or it may be otherwise coupled to a grease conduit or other source of grease.
- the metering wall 118 acts as a flow restrictor between the charging chamber 116 and the storage chamber 112 .
- Fresh grease entering the charging chamber 116 from the inlet port 136 will have a tendency to enter the bearing 26 . As voids between ball bearings within the bearing 26 fill with grease, excess grease from the charging chamber 116 will migrate over the metering wall 118 and into the storage chamber 112 . New grease entering the storage chamber 112 from the charging chamber 90 will force old grease out.
- Grease exits the storage chamber 112 through an exit port 140 .
- the charging chamber 116 and storage chamber 112 together do not provide a full 360 degrees of grease to the bearing bore 70 . Rather, a bounded area 144 between the first boundary wall 120 and the second boundary wall 122 , in the clockwise direction from the perspective of FIG. 2 , is intended to remain free of grease.
- the storage chamber 112 plus the charging chamber 116 provides an optimal amount of grease to the bearing 18 . Because the first boundary wall and second boundary extend to the same level as the axial bearing seating surface, they substantially inhibit grease from entering the bounded area 144 . By maintaining the bounded area 144 of the bearing lubrication system 102 grease-free, heat transfer from the bearing 26 to the end-frame 14 is improved, thereby improving bearing life.
- the invention provides, among other things, an end-frame 14 for an electric motor assembly 10 .
- an end-frame 14 for an electric motor assembly 10 .
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
- The present invention relates to electric motors. More particularly, the invention relates to an electric motor that includes an end frame.
- An end frame for an electric motor should generally be rigid in order to minimize vibration and other adverse effects. In some cases, it is desirable to provide a flow path through the end frame for air cooling of the motor components. Some electric motors may also require periodic maintenance at the end frame, including the addition of grease to one or more shaft bearings.
- In one embodiment, the invention provides an end frame for an electro-dynamic machine having a rotor shaft extending along a rotational axis and a bearing rotatably supporting the rotor shaft. The end frame includes a radial bearing support surface disposed concentrically about the axis and an axial bearing support surface substantially perpendicular to the axis. A base wall is substantially perpendicular to the axis. A first annular wall is disposed concentrically about the axis and extends from the base wall to the axial bearing support surface. A second annular wall is disposed radially outward of the first annular wall and cooperates therewith to define an annular space that extends from the base wall to the axial bearing support surface. A first boundary wall extends across the annular space from the base wall to the axial bearing support surface. A metering wall extends across the annular space a portion of a distance from the base wall to the axial bearing support surface. The base wall, the axial bearing support surface, the first annular wall, the second annular wall, the first boundary wall and the metering wall cooperate to define a first chamber for receiving grease. A second boundary wall extends across the annular space from the base wall to the axial bearing support surface. The base wall, the axial bearing support surface, the first annular wall, the second annular wall, the metering wall and the second boundary wall cooperate to define a second chamber for receiving grease.
- In another embodiment the invention provides an electro-dynamic machine. The machine includes a shaft member extending along an axis and a bearing supporting the shaft for rotation about the axis. A cylindrical housing is disposed concentric with the axis and radially supports the bearing. An axial bearing support surface is substantially perpendicular to the axis and axially supports the bearing. A base wall is axially displaced from the axial bearing support surface. A first annular wall is disposed concentrically about the axis and extends from the base wall to the axial bearing support surface. A second annular wall is disposed radially outward of the first annular wall and cooperates therewith to define an annular space that extends from the base wall to the axial bearing support surface. A first boundary wall extends across the annular space from the base wall to the axial bearing support surface. A metering wall extends across the annular space a portion of a distance from the base wall to the axial bearing support surface. The base wall, the axial bearing support surface, the first annular wall, the second annular wall, the first boundary wall and the metering wall cooperate to define a first chamber for receiving grease. A second boundary wall extends across the annular space from the base wall to the axial bearing support surface. The base wall, the axial bearing support surface, the first annular wall, the second annular wall, the metering wall and the second boundary wall cooperate to define a second chamber for receiving grease.
- Other aspects of the invention will become apparent by consideration of the detailed description and accompanying drawings.
-
FIG. 1 is a cross-sectional view of an electric motor. -
FIG. 2 is an exploded perspective view of a sub-assembly of the electric motor ofFIG. 1 . -
FIG. 3 is a top view of an end frame of the sub-assembly ofFIG. 2 . -
FIG. 4 is a top view of a bearing lubrication system of the end frame ofFIG. 3 . -
FIG. 5 is a bottom perspective view of the end frame ofFIG. 3 . -
FIG. 6 is a cross sectional view of the bearing lubrication system ofFIG. 4 taken along section line 6-6. - Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings.
-
FIG. 1 is a schematic cross section of anelectric motor 10. Theelectric motor 10 includes anend frame 14 and anopposite end frame 18. Arotor shaft 22 is rotatably supported by an end frame bearing 26 and an opposite end frame bearing 30. Therotor shaft 22 supports arotor 34 for rotation about anaxis 38. Therotor 34 rotates relative to astator 42. Thestator 42 is enclosed within astator housing 44 and is disposed between theend frame 14 and theopposite end frame 18. -
FIG. 2 is an exploded perspective view of asub-assembly 46 of theelectric motor 10. More specifically, thesub-assembly 46 includes therotor shaft 22, the end frame bearing 26, and theend frame 14. Theend frame 14 includes anouter housing 50 and aninner housing 54. Theouter housing 50 includes fourmounting flanges 58. Eachmounting flange 58 includes a through-hole 62. The through-holes 62 are provided, for example, to receive assembly bolts for coupling theend frame 14 to theopposite end frame 18. Fewer than four through-holes 62 or more than four may alternatively be provided, as required. - The
inner housing 54 defines abearing cavity 66. Thebearing cavity 66 includes aprecision bearing bore 70. Thebearing bore 70 is configured to receive the end frame bearing 26. Ashaft aperture 74 of theinner housing 54 allows anextension 76 of theshaft 22 to pass through theend frame 14 and couple to the load. - A ventilated
lattice 78 connects theouter housing 50 andinner housing 54. Thelattice 78 facilitates the flow of air (or other fluids) through the motor to cool the rotor, stator, and bearings during motor operation. With reference toFIG. 3 , thelattice 78 is formed by a combination ofradial ribs 82, non-radial ribs 86, andannular ribs 90. As used herein, “non-radial” ribs do not include annular ribs. Thelattice 78 is sufficiently rigid to substantially minimize oscillation of theend frame 14, while at the same time allowing for adequate cooling flow through the motor, thereby improving the life of the end frame bearing 26. While theradial ribs 82, non-radial ribs 86, andannular ribs 90 are described herein as discrete elements, in the illustrated embodiment, theentire end frame 14 is formed as a single component. Theinner housing 54,outer housing 50, andlattice 78 may be formed by casting, forging, machining, injection molding, or other known manufacturing methods. - During assembly of the
electric motor 10, theend frame 14 should slide freely over the end frame bearing 26. If the bearing bore 70 is out of round, a number of assembly problems may result. For example, if theend frame 14 is forced over the bearing 26 with a mallet, the resulting impact forces may dent the balls and/or raceways of the bearing assembly, which may result in premature bearing wear. The non-radial ribs 86 are configured to reduce deformation of the bearing bore 50 during machining of theend frame 22. - As best illustrated in
FIG. 3 , the non-radial ribs 86 are arranged in threepairs 94. The threepairs 94 of non-radial ribs 86 are arranged symmetrically (i.e., eachpair 94 is approximately 120 degrees apart from the next pair). This symmetrical arrangement of the threepairs 94 corresponds generally to contact points 96 (FIGS. 2 and 5 ) for a three jawed chuck, such as is used to hold theend frame 14 when machining the bearing bore 70 and other surfaces of theend frame 14. Referring back toFIG. 3 , the non-radial ribs 86 of eachpair 94 form a “V” shape, with avertex 98 adjacent theouter housing 50. In the illustrated embodiment, thevertex 98 is illustrated radially outward of theouter housing 50. In other embodiments, the vertex may lie on or in thehousing 50. Each of the non-radial ribs 86 contacts theinner housing 54 substantially tangentially, as opposed to radially. With this arrangement, the non-radial ribs 86 transmit clamping forces to the inner housing and apply them in a direction that is tangent to the bore, thereby reducing deformation of theinner housing 54 when chucked. The resulting bearing bore 70 can be machined with a roundness having a tighter tolerance than would otherwise be possible with radial ribs that transmit the chuck clamping forces to radially to the bore. - In addition to the non-radial ribs 86, three of the
radial ribs 82 are arranged symmetrically between non-radial ribs 86. Additionalradial ribs 82 cross, or intersect, several of the non-radial ribs 86. - The bearing
cavity 66 includes abearing lubrication system 102. With reference toFIGS. 4 and 6 , the bearinglubrication system 102 extends from abase wall 106 of the bearingcavity 66 toward anaxial seating surface 108 of the bearing bore 70. Thebase wall 106 surrounds theshaft aperture 74. When the end frame bearing 26 is installed in the bearing bore 70, thebearing 26 encloses thebearing lubrication system 102. The bearinglubrication system 102 includes agrease storage chamber 112, a chargingchamber 116, and ametering wall 118. The chargingchamber 116 extends circumferentially about theshaft aperture 74 from afirst boundary wall 120 to themetering wall 118. Thegrease storage chamber 112 extends circumferentially about theshaft aperture 74 from themetering wall 118 to asecond boundary wall 122. Thefirst boundary wall 120 andsecond boundary wall 122 extend axially to the same level as theaxial seating surface 108, and therefore define a portion of theseating surface 108 and make contact with the end frame bearing 26 when installed. As shown inFIG. 6 , themetering wall 118 does not extend all the way to theaxial seating surface 108 of the bearing bore 70. - The charging
chamber 116 andstorage chamber 112 are both bounded by an innerannular wall 128 and an outerannular wall 132. In the illustrated embodiment, the innerannular wall 128 of the chargingchamber 116 andstorage chamber 112 is not parallel to the axis 38 (i.e., frusto-conical). When themotor assembly 10 is mounted with theaxis 38 horizontal, the shape of the innerannular wall 128 assists grease in from the charging chamber and a portion of the storage chamber migrating toward the bearing 26 during motor operation. - As shown in
FIGS. 4 and 5 , the chargingchamber 116 receives grease from agrease inlet port 136. Thegrease inlet port 136 may be threaded for a screw-in grease fitting (such as a “Zerk” fitting), or it may be otherwise coupled to a grease conduit or other source of grease. Themetering wall 118 acts as a flow restrictor between the chargingchamber 116 and thestorage chamber 112. Fresh grease entering the chargingchamber 116 from theinlet port 136 will have a tendency to enter thebearing 26. As voids between ball bearings within thebearing 26 fill with grease, excess grease from the chargingchamber 116 will migrate over themetering wall 118 and into thestorage chamber 112. New grease entering thestorage chamber 112 from the chargingchamber 90 will force old grease out. Grease exits thestorage chamber 112 through anexit port 140. - As best illustrated in
FIG. 4 , the chargingchamber 116 andstorage chamber 112 together do not provide a full 360 degrees of grease to the bearing bore 70. Rather, abounded area 144 between thefirst boundary wall 120 and thesecond boundary wall 122, in the clockwise direction from the perspective ofFIG. 2 , is intended to remain free of grease. Thestorage chamber 112 plus the chargingchamber 116 provides an optimal amount of grease to thebearing 18. Because the first boundary wall and second boundary extend to the same level as the axial bearing seating surface, they substantially inhibit grease from entering thebounded area 144. By maintaining thebounded area 144 of thebearing lubrication system 102 grease-free, heat transfer from the bearing 26 to the end-frame 14 is improved, thereby improving bearing life. - Thus, the invention provides, among other things, an end-
frame 14 for anelectric motor assembly 10. Various features and advantages of the invention are set forth in the following claims.
Claims (16)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/026,473 US20120205999A1 (en) | 2011-02-14 | 2011-02-14 | Electric motor having an end frame |
PCT/US2012/024959 WO2012112480A1 (en) | 2011-02-14 | 2012-02-14 | Electric motor having an end frame |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/026,473 US20120205999A1 (en) | 2011-02-14 | 2011-02-14 | Electric motor having an end frame |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120205999A1 true US20120205999A1 (en) | 2012-08-16 |
Family
ID=45833507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/026,473 Abandoned US20120205999A1 (en) | 2011-02-14 | 2011-02-14 | Electric motor having an end frame |
Country Status (2)
Country | Link |
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US (1) | US20120205999A1 (en) |
WO (1) | WO2012112480A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3048724A (en) * | 1958-07-31 | 1962-08-07 | Westinghouse Electric Corp | Bearing assembly for dynamoelectric machines |
US3833276A (en) * | 1973-04-12 | 1974-09-03 | Gen Electric | Lubricating means for a dynamoelectric machine end shield housing |
US5001377A (en) * | 1990-01-12 | 1991-03-19 | Magnetek, Inc. | Lubrication system with inlet and outlet packets |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54107812U (en) * | 1978-01-18 | 1979-07-30 | ||
JPH06221331A (en) * | 1993-01-25 | 1994-08-09 | Mitsubishi Denki Eng Kk | Bearing device and cleaning |
-
2011
- 2011-02-14 US US13/026,473 patent/US20120205999A1/en not_active Abandoned
-
2012
- 2012-02-14 WO PCT/US2012/024959 patent/WO2012112480A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3048724A (en) * | 1958-07-31 | 1962-08-07 | Westinghouse Electric Corp | Bearing assembly for dynamoelectric machines |
US3833276A (en) * | 1973-04-12 | 1974-09-03 | Gen Electric | Lubricating means for a dynamoelectric machine end shield housing |
US5001377A (en) * | 1990-01-12 | 1991-03-19 | Magnetek, Inc. | Lubrication system with inlet and outlet packets |
Also Published As
Publication number | Publication date |
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WO2012112480A1 (en) | 2012-08-23 |
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